sooooo, okay here goes, i have used the mirena iud for four years, had them switched and replace twice, once for weird tissue discharge, and second because of cramps and couldnt feel strings, i have never had a period as long as a mirena was in place, in four years, however just recently, i have been profusely tired, weak, sick to my stomach, headache everyday, and maaajooor weight gain on just my abdomen and my weight is horribly hard to manage, unless i eat nothing but salad my weight jumps up to 165 and i am only 5'6, so i think from reading all these posts, side effects are definitely common as far as missed periods, weakness, tiredness, abdomen weight gain and sore breasts, and i have swore i was pregnant twice, but the mirena just often makes you look and feel that way, i am thinking about getting it removed permanently because the weight gain and headaches are just too much for me, my man thinks i should get a hpt this time though because of my stomach weight gain and shape, i dont know, .....